Bump the version number to 0.6.3.
Bump the version number to 0.6.3.

Changes since 0.6.2:
- Fix reading of old GE transfer syntax 1.2.840.113619.5.2.
- Fix SetAttributeValue method for creating AT from tag enum constants.
- Add string-to-AT automatic conversion to vtkDICOMValue construction.
- Add vtkDICOMValue method for creating sequence from a single item.
- Fix bug where a DICOMDIR with thumbnails could be misdetected as image.

hendradarwin/vtk-dicom,hendradarwin/vtk-dicom,dgobbi/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,dgobbi/vtk-dicom